单项选择题

Passage Two
Questions 29 to 31 are based on the passage you have just heard.

A．Call the housing office.
B．Repair holes in room walls.
C．Remove personal property.
D．Register for summer school.
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单项选择题
A．To complete them with the aid of their tutors.B．To accomplish them mainly through their own efforts.C．To read all the reference books assigned by the professors.D．To go over all the periodicals, articles and books in the library.
A．To complete them with the aid of their tutors.
B．To accomplish them mainly through their own efforts.
C．To read all the reference books assigned by the professors.
D．To go over all the periodicals, articles and books in the library.
单项选择题
According to the passage, tornadoes can destroy buildings because the ______.
A．force of tornado increases the air pressure in a building
B．air pressure at the center of a tornado is as strong as over 172,000, pounds
C．weight of a tornado can crush a building’s roof when it passes overhead
D．air pressure inside a tornado is less than air pressure inside a building
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